uvm_fault(0xfffffd806dc02930, 0x8, 0, 1) -> e kernel: page fault trap, code=0 Stopped at witness_checkorder+0x1ec: movl 0x8(%r14),%ebx TID PID UID PRFLAGS PFLAGS CPU COMMAND 95294 78419 0 0 0 1 syz-executor2882152583 witness_checkorder(fffffd806f1bd1c0,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd806f1bd1b0) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff80002120cd68,fffffd806f1bd1b0,fffffd806f1bd238,3,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff80002120cd68,3) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff80002120cd68) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff80002120cd68,0,0,1) at exit1+0x3ff sys/kern/kern_exit.c:206 sys_exit(ffff80002120cd68,ffff800021299b10,ffff800021299b60) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff800021299be0) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff800021299be0) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6f911c3136e0, count: 6 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs. ddb{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic *cpu0: uvm_fault(0xfffffd806dc02930, 0x8, 0, 1) -> e ddb{0}> trace witness_checkorder(fffffd806f1bd1c0,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd806f1bd1b0) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff80002120cd68,fffffd806f1bd1b0,fffffd806f1bd238,3,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff80002120cd68,3) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff80002120cd68) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff80002120cd68,0,0,1) at exit1+0x3ff sys/kern/kern_exit.c:206 sys_exit(ffff80002120cd68,ffff800021299b10,ffff800021299b60) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff800021299be0) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff800021299be0) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6f911c3136e0, count: -9 ddb{0}> show registers rdi 0 rsi 0x20000 acpi_pdirpa+0xbe63 rbp 0xffff8000212998b0 rbx 0xe rdx 0 rcx 0xfffffd80037e3b40 rax 0xffffffff82bffff0 cpu_info_full_primary+0x1ff0 r8 0x1 r9 0 r10 0xa0ac3d2cae112927 r11 0x6fa576a37f506e80 r12 0 r13 0xfffffd806f1bd1c0 r14 0 r15 0xffff80002120cd68 rip 0xffffffff81b8d00c witness_checkorder+0x1ec cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff800021299800 ss 0x10 witness_checkorder+0x1ec: movl 0x8(%r14),%ebx ddb{0}> show proc PROC (syz-executor2882152583) pid=381490 stat=onproc flags process=1008 proc=2000 pri=0, usrpri=75, nice=20 forw=0xffffffffffffffff, list=0xffff80002120cac0,0xffff80002120dd68 process=0xffff8000ffff7ab8 user=0xffff800021294000, vmspace=0xfffffd806dc02930 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 78419 95294 51332 0 7 0 syz-executor2882152583 69031 153546 16200 0 2 0 syz-executor2882152583 69031 8008 16200 0 3 0x4000080 fsleep syz-executor2882152583 24394 320562 47623 0 2 0 syz-executor2882152583 24394 240315 47623 0 2 0x4000000 syz-executor2882152583 64815 120473 9456 0 3 0x80 nanoslp syz-executor2882152583 88513 27388 9456 0 3 0x80 nanoslp syz-executor2882152583 25022 452713 9456 0 3 0x80 nanoslp syz-executor2882152583 85018 159587 9456 0 3 0x80 nanoslp syz-executor2882152583 16200 41945 9456 0 3 0x80 nanoslp syz-executor2882152583 47623 369575 9456 0 3 0x80 nanoslp syz-executor2882152583 23851 194684 9456 0 3 0x80 nanoslp syz-executor2882152583 51332 383147 9456 0 3 0x80 nanoslp syz-executor2882152583 9456 495115 99107 0 3 0x82 nanoslp syz-executor2882152583 99107 317907 37354 0 3 0x10008a sigsusp ksh 37354 502223 80549 0 3 0x9a kqread sshd 74933 220479 1 0 3 0x100083 ttyin getty 80549 304883 1 0 3 0x88 kqread sshd 39572 38730 41451 73 3 0x1100090 kqread syslogd 41451 155677 1 0 3 0x100082 netio syslogd 53234 315483 1 0 3 0x100080 kqread resolvd 4427 31103 72332 77 3 0x100092 kqread dhcpleased 88658 20077 72332 77 3 0x100092 kqread dhcpleased 72332 318739 1 0 3 0x80 kqread dhcpleased 24340 413715 0 0 3 0x14200 bored smr 64652 237056 0 0 2 0x14200 zerothread 61628 30117 0 0 3 0x14200 aiodoned aiodoned 5288 271883 0 0 3 0x14200 syncer update 26003 199798 0 0 3 0x14200 cleaner cleaner 85011 405704 0 0 2 0x14200 reaper 86432 390670 0 0 3 0x14200 pgdaemon pagedaemon 23010 141934 0 0 3 0x14200 bored viomb 70913 170784 0 0 3 0x40014200 acpi0 acpi0 35031 32950 0 0 3 0x40014200 idle1 51818 44877 0 0 3 0x14200 bored softnet3 84856 189350 0 0 3 0x14200 bored softnet2 22879 234216 0 0 3 0x14200 bored softnet1 35109 391418 0 0 3 0x14200 bored softnet0 8607 64417 0 0 3 0x14200 bored systqmp 43853 100843 0 0 3 0x14200 bored systq 6431 66055 0 0 3 0x40014200 bored softclock 35630 98530 0 0 3 0x40014200 idle0 1 377818 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 78419 (syz-executor2882152583) thread 0xffff80002120c020 (95294) exclusive rwlock uobjlk r = 0 (0xfffffd807efaf4e0) #0 witness_lock+0x447 #1 rw_enter+0x3c8 sys/kern/kern_rwlock.c:309 #2 uvm_fault_lower_lookup+0x4a sys/uvm/uvm_fault.c:1126 #3 uvm_fault_lower+0x63 sys/uvm/uvm_fault.c:1227 #4 uvm_fault+0x238 #5 upageflttrap+0x86 sys/arch/amd64/amd64/trap.c:188 #6 usertrap+0x226 sys/arch/amd64/amd64/trap.c:436 #7 recall_trap+0x8 shared rwlock vmmaplk r = 0 (0xfffffd806f147a10) #0 witness_lock+0x447 #1 uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1772 #2 uvm_fault_check+0x3e sys/uvm/uvm_fault.c:672 #3 uvm_fault+0xf2 sys/uvm/uvm_fault.c:600 #4 upageflttrap+0x86 sys/arch/amd64/amd64/trap.c:188 #5 usertrap+0x226 sys/arch/amd64/amd64/trap.c:436 #6 recall_trap+0x8 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10156 6389K 6420K 78643K 11234 0 pcb 13 8K 8K 78643K 13 0 rtable 58 1K 2K 78643K 110 0 pf 12 6K 6K 78643K 12 0 ifaddr 12 9K 9K 78643K 12 0 ifgroup 17 1K 1K 78643K 17 0 counters 44 33K 33K 78643K 44 0 ioctlops 0 0K 2K 78643K 21 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1174 73K 74K 78643K 1187 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 1K 78643K 2 0 VM map 2 1K 1K 78643K 2 0 sem 2 0K 0K 78643K 2 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 1 0K 0K 78643K 1 0 proc 55 78K 79K 78643K 246 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 11 0K 0K 78643K 11 0 ether_multi 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 25 122K 122K 78643K 25 0 exec 0 0K 1K 78643K 243 0 tdb 3 0K 0K 78643K 3 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 8 62K 64K 78643K 10 0 UVM amap 135 70K 71K 78643K 7608 0 UVM aobj 3 2K 2K 78643K 3 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 3 0K 0K 78643K 3 0 temp 1 5904K 5968K 78643K 2809 0 kqueue 11 16K 26K 78643K 753 0 SYN cache 2 16K 16K 78643K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 22 0 0 1 0 1 1 0 8 0 rtpcb 120 20 0 17 1 0 1 1 0 8 0 rtentry 112 23 0 1 1 0 1 1 0 8 0 unpcb 144 33 0 20 1 0 1 1 0 8 0 syncache 304 5 0 5 2 1 1 1 0 8 1 tcpqe 32 87 0 87 1 1 0 1 0 8 0 tcpcb 808 8 0 5 1 0 1 1 0 8 0 arp 120 2 0 0 1 0 1 1 0 8 0 inpcb 368 761 0 753 2 0 2 2 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 97 0 0 7 0 7 7 0 8 0 art_table 32 98 0 0 1 0 1 1 0 8 0 art_node 16 22 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1422 0 37 87 0 87 87 0 8 0 ffsino 272 1422 0 37 93 0 93 93 0 8 0 nchpl 144 1606 0 47 58 0 58 58 0 8 0 uvmvnodes 80 1431 0 0 30 0 30 30 0 8 0 vnodes 216 1431 0 0 80 0 80 80 0 8 0 namei 1024 4256 0 4256 2 1 1 1 0 8 1 percpumem 16 35 0 0 1 0 1 1 0 8 0 kstatmem 264 6 0 0 1 0 1 1 0 8 0 scxspl 216 5124 0 5124 10 9 1 8 1 8 1 plimitpl 152 24 0 10 1 0 1 1 0 8 0 sigapl 424 1054 0 1008 6 0 6 6 0 8 0 futexpl 64 1923 0 1922 1 0 1 1 0 8 0 knotepl 120 43 0 0 2 0 2 2 0 8 0 kqueuepl 216 754 0 747 1 0 1 1 0 8 0 pipepl 320 87 0 84 2 1 1 1 0 8 0 fdescpl 496 1037 0 1012 5 1 4 4 0 8 0 filepl 152 1861 0 1806 3 0 3 3 0 8 0 lockfpl 104 6 0 4 1 0 1 1 0 8 0 lockfspl 48 4 0 2 1 0 1 1 0 8 0 sessionpl 144 17 0 9 1 0 1 1 0 8 0 pgrppl 48 17 0 9 1 0 1 1 0 8 0 ucredpl 104 66 0 56 1 0 1 1 0 8 0 zombiepl 144 1013 0 1008 2 1 1 1 0 8 0 processpl 1072 1054 0 1008 4 0 4 4 0 8 0 procpl 680 1816 0 1767 5 0 5 5 0 8 0 sockpl 488 814 0 790 4 0 4 4 0 8 0 mcl8k 8192 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 258 0 0 33 2 31 33 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 262 0 0 17 0 17 17 0 8 0 bufpl 288 2511 0 88 174 0 174 174 0 8 0 anonpl 24 202573 0 200567 27 13 14 24 0 186 1 amapchunkpl 152 25492 0 25267 14 1 13 13 0 158 2 amappl16 200 5416 0 5415 6 5 1 5 0 8 0 amappl15 192 11 0 11 1 1 0 1 0 8 0 amappl14 184 116 0 107 1 0 1 1 0 8 0 amappl13 176 9 0 9 1 1 0 1 0 8 0 amappl12 168 1526 0 1508 1 0 1 1 0 8 0 amappl11 160 54 0 44 1 0 1 1 0 8 0 amappl10 152 14 0 14 2 2 0 1 0 8 0 amappl9 144 152 0 152 2 2 0 1 0 8 0 amappl8 136 34 0 32 1 0 1 1 0 8 0 amappl7 128 759 0 745 1 0 1 1 0 8 0 amappl6 120 143 0 130 1 0 1 1 0 8 0 amappl5 112 102 0 94 1 0 1 1 0 8 0 amappl4 104 413 0 384 1 0 1 1 0 8 0 amappl3 96 6968 0 6917 2 0 2 2 0 8 0 amappl2 88 460 0 417 3 1 2 2 0 8 0 amappl1 80 12112 0 11660 15 4 11 11 0 8 0 amappl 88 7330 0 7241 3 0 3 3 0 92 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 253 0 253 1 1 0 1 0 8 0 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 1037 0 1012 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1037 0 1012 1 0 1 1 0 8 0 vmmpekpl 168 10367 0 10344 2 0 2 2 0 8 0 vmmpepl 168 62222 0 60977 68 6 62 62 0 357 4 vmsppl 464 1036 0 1012 5 1 4 4 0 8 0 rwobjpl 56 25263 0 23184 31 1 30 31 0 8 0 pdppl 4096 2082 0 2024 88 22 66 66 0 8 8 pvpl 32 343845 0 339048 63 20 43 52 0 265 2 pmappl 248 1036 0 1012 3 1 2 2 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 518 0 27 15 0 15 15 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace witness_checkorder(fffffd806f1bd1c0,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd806f1bd1b0) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff80002120cd68,fffffd806f1bd1b0,fffffd806f1bd238,3,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff80002120cd68,3) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff80002120cd68) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff80002120cd68,0,0,1) at exit1+0x3ff sys/kern/kern_exit.c:206 sys_exit(ffff80002120cd68,ffff800021299b10,ffff800021299b60) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff800021299be0) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff800021299be0) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6f911c3136e0, count: -9 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp x86_ipi_db(ffff800020d58ff0) at x86_ipi_db+0x1e sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff82cd6528) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82cd6528) at __mp_lock+0x122 sys/kern/kern_lock.c:147 syscall(ffff80002125d660) at syscall+0x5cd mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002125d660) at syscall+0x5cd sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6f911c313650, count: 9 ddb{1}> trace x86_ipi_db(ffff800020d58ff0) at x86_ipi_db+0x1e sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff82cd6528) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82cd6528) at __mp_lock+0x122 sys/kern/kern_lock.c:147 syscall(ffff80002125d660) at syscall+0x5cd mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002125d660) at syscall+0x5cd sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6f911c313650, count: -6